Front sight tightening tool



aw 19, 1940. c. E. HARRIS FRONT SIGHT 'TIGHTENiNG TOOL Filed Jupe s; 19:52

Inventor E Eliarris Glare Evy Patented Mar. 19, 1940 v UNITED" ST TES 1 Claim.

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to a front sight tightening tool and more particularly to such a tool for resetting the fixed stud of the front sight used on army rifles.

Continuous use of a rifle causes the movable part of the sight to be struck more or less often, such as when placing the rifle in or removing it from an arms rack, with the result that the material of the fixed stud becomes sprung, thereby widening the dovetail groove in such stud and consequently loosening the movable stud.

While devices are now' in use for restoring the fixed stud to its original shape andposition the present device aims to restore the fixed stud to thereby tighten the movable stud without the With the foregoing and such other objects in A view, the invention resides in the novel arrangement and combination of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made Within the scope of what is claimed Without departing from the spirit of the invention.

A practical embodiment of the invention is illustrated in the accompanying drawing, wherein:

Fig. 1 is a side elevation partly in section and with parts removed of the tool applied to a rifle barrel preparatory to tightening the sight;

Fig. 2 is a similar view showing relation of the parts during tightening of the sight;

Fig. 3 is a plan view of the tool, parts broken away;

Figs. 4, 5 and 6 are sections on the respective lines of Fig. 1;

Fig. 7 is a detail perspective view of the eccentric for mounting the resetting element;

Figs. 8 and 9 are respectively a plan and elevation of the hollow die; and

Figs. 10 and 11 are respectively a side elevation and plan of the resetting element.

Referring to the drawing by numerals of reference:

A conventional front sight for a rifle barrel A comprises a fixed stud 13 (Figs. 4 and 5) which is in the form of a sleeve having a longitudinally extending groove C for receiving a key D on the barrel to prevent lateral displacement and having an aperture for receiving a transversely disposed pin E'which engages a groove F in the barrel to prevent longitudinal displacement. The fixed stud B is formed on its upper side with a longitudinal rib G having a transversely disposed dove- 5 tail groove H for receiving the dovetail tongue I of the movable stud J carrying the front sighting member K. The stud J is held in place in the stud B by a screw L.

The tool for tightening the front sight com- 10 prises a frame consisting of spaced links 5- 5 offset intermediate their ends to space the front ends of the links a greater amount than the rear ends. A head disposed between the front ends of the links is preferably of two parts, a socket 15 member 6 and a hollow die I fitted therein and conveniently held by a set screw 8. The socket member 6 includes a pair of trunnions 99 rotatably mounted in apertures I 0 of the links and a screw ll threaded in each trunnion has an enlarged head l2 for engaging the outer side of the corresponding link to maintain the assembly.

to close it onto the barrel A and secure the stud against longitudinal displacement while at the same time the spaced projections |3-l3 which engage the stud on both sides of the key D will upset the metal to remove lateral looseness.

The rear portions of the links 5-5 are provided with aligned apertures I5-l5 in which the ends [5 of a pin l6 are journaled. A screw ll provided for each end of the pin and threaded therein has an enlarged head I 8 for engaging the outer side of the corresponding link to maintain the assembly. The pin l6 includes a centrally positioned eccentric disk I9 and on each side thereof it is formed with non-circular portions -40 which serve to space the links and mount the forked ends 2l2l of a lever 22 which is conveniently made in two parts held together by with a face 29 for engaging the rear face of the .55.

rib G and it also has a pair of spaced jaws 30-30 for embracing the rib.

In Fig. 1 the tongue I of the fixed stud J is shown as being loose in the groove H due to displacement of the metal of the rib G which forms the rear walls of the groove. In order to reset this metal for the purpose of firmly holding the stud J the tool is applied as shown in Fig. 1 whereby the die 1 and resetting member 24 are disposed so as to engage opposite sides of the stud B and the lever 22 is then moved to the rear. This operation on the lever produces rotation of the pin l6 and the eccentric disk I9 advances the resetting member 24 and resets the metal of the rear wall of the groove. This engagement establishes a support during continued operation of the lever whereby the die I is retracted to squeeze the metal of the front face of the stud B.

I claim:

A tool for tightening a front sight provided with a fixed stud comprising a pair of spaced links, a hollow die for engaging the front face of the stud trunnioned in the links, a pin journaled in the links, and including an eccentric disk, a lever mounted on the pin for rotation therewith, a resetting member for engaging the rear face of the stud slidably supported by the links and in driving engagement with the eccentric disk.

CLARENCE E. HARRIS. 

